Jeroni Paul wrote:

By your descriptions it looks like your supply is working fine. It is
normal for some components to warm up and if it were faulty you would
see some problem with your supply. If it works, don't mess with it.

Bad advice.

Some components may have been stressed by the fault The charring near the diode
indicates this.

There's NO WAY to prove the diode hasn't had its reliability compromised through
overheating so it should be replaced as a precaution.

Graham